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Ah ↔ Wh Calculator

Convert battery capacity between amp-hours and watt-hours so you can compare banks at different voltages.

Wh = Ah × V · free · no account

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Result

Energy
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Wh = Ah × volts. Usable energy is less (depth of discharge).
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The battery-bank calculator turns your daily energy into the Ah and kWh you need — and the designer builds the rest.

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Ah vs Wh

Watt-hours = amp-hours × voltage. Wh is the fair way to compare batteries, because a 100 Ah 12 V battery (1,200 Wh) holds half the energy of a 100 Ah 24 V battery. Remember usable energy is less than nameplate (depth of discharge).

Questions

Why convert to Wh?

Amp-hours alone hide voltage. Watt-hours let you compare a 12 V and a 48 V bank on equal energy terms.

Design your whole system — free

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Planning aid — not a substitute for a licensed electrician. Wattonomy sizes to ABYC E-11 / ISO 13297 / BS 7671 / AS/NZS 3008, but every install has factors a calculator can't see. Verify against the hardware datasheets and your local code, and have the work checked by a professional. Improper electrical work can cause fire, injury or death.